Android自定义捕获Application全局异常（转载）

 package qianlong.qlmobile.ui;

 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.FilenameFilter;
 import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.io.Writer;
 import java.lang.Thread.UncaughtExceptionHandler;
 import java.lang.reflect.Field;
 import java.util.Arrays;
 import java.util.Properties;
 import java.util.TreeSet;

 import android.content.Context;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.PackageManager.NameNotFoundException;
 import android.os.Build;
 import android.os.Looper;
 import android.text.format.Time;
 import android.util.Log;
 import android.view.Gravity;
 import android.widget.Toast;

 public class CrashHandler implements UncaughtExceptionHandler {

     /** Debug Log tag*/
     public static final String TAG = "CrashHandler";
     /** 是否开启日志输出,在Debug状态下开启,
     * 在Release状态下关闭以提示程序性能
     * */
     public static final boolean DEBUG = false;
     /** 系统默认的UncaughtException处理类 */
     private Thread.UncaughtExceptionHandler mDefaultHandler;
     /** CrashHandler实例 */
     private static CrashHandler INSTANCE;
     /** 程序的Context对象 */
     private Context mContext;
     /** 使用Properties来保存设备的信息和错误堆栈信息*/
     private Properties mDeviceCrashInfo = new Properties();
     private static final String VERSION_NAME = "versionName";
     private static final String VERSION_CODE = "versionCode";
     private static final String STACK_TRACE = "STACK_TRACE";
     /** 错误报告文件的扩展名 */
     private static final String CRASH_REPORTER_EXTENSION = ".cr";

     /** 保证只有一个CrashHandler实例 */
     private CrashHandler() {}

     /** 获取CrashHandler实例 ,单例模式*/
     public static CrashHandler getInstance() {
         if (INSTANCE == null) {
             INSTANCE = new CrashHandler();
         }
         return INSTANCE;
     }

     /**
     * 初始化,注册Context对象,
     * 获取系统默认的UncaughtException处理器,
     * 设置该CrashHandler为程序的默认处理器
     * @param ctx
     */
     public void init(Context ctx) {
         mContext = ctx;
         mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
         Thread.setDefaultUncaughtExceptionHandler(this);
     }

     /**
     * 当UncaughtException发生时会转入该函数来处理
     */
     @Override
     public void uncaughtException(Thread thread, Throwable ex) {
         if (!handleException(ex) && mDefaultHandler != null) {
             //如果用户没有处理则让系统默认的异常处理器来处理
             mDefaultHandler.uncaughtException(thread, ex);
         } else {
             //Sleep一会后结束程序
             try {
                 Thread.sleep(5000);
             } catch (InterruptedException e) {
                 Log.e(TAG, "Error : ", e);
             }
             android.os.Process.killProcess(android.os.Process.myPid());
             System.exit(10);
         }
     }

     /**
     * 自定义错误处理,收集错误信息
     * 发送错误报告等操作均在此完成.
     * 开发者可以根据自己的情况来自定义异常处理逻辑
     * @param ex
     * @return true:如果处理了该异常信息;否则返回false
     */
     private boolean handleException(Throwable ex) {
         if (ex == null) {
             Log.w(TAG, "handleException --- ex==null");
             return true;
         }
         final String msg = ex.getLocalizedMessage();
         if(msg == null) {
             return false;
         }
         //使用Toast来显示异常信息
         new Thread() {
             @Override
             public void run() {
                 Looper.prepare();
                 Toast toast = Toast.makeText(mContext, "程序出错，即将退出:\r\n" + msg,
                         Toast.LENGTH_LONG);
                 toast.setGravity(Gravity.CENTER, 0, 0);
                 toast.show();
 //              MsgPrompt.showMsg(mContext, "程序出错啦", msg+"\n点确认退出");
                 Looper.loop();
             }
         }.start();
         //收集设备信息
         collectCrashDeviceInfo(mContext);
         //保存错误报告文件
         saveCrashInfoToFile(ex);
         //发送错误报告到服务器
         //sendCrashReportsToServer(mContext);
         return true;
     }

     /**
     * 在程序启动时候, 可以调用该函数来发送以前没有发送的报告
     */
     public void sendPreviousReportsToServer() {
         sendCrashReportsToServer(mContext);
     }
     /**
     * 把错误报告发送给服务器,包含新产生的和以前没发送的.
     * @param ctx
     */
     private void sendCrashReportsToServer(Context ctx) {
         String[] crFiles = getCrashReportFiles(ctx);
         if (crFiles != null && crFiles.length > 0) {
         TreeSet<String> sortedFiles = new TreeSet<String>();
         sortedFiles.addAll(Arrays.asList(crFiles));
         for (String fileName : sortedFiles) {
         File cr = new File(ctx.getFilesDir(), fileName);
         postReport(cr);
         cr.delete();// 删除已发送的报告
         }
         }
     }
     private void postReport(File file) {
         // TODO 发送错误报告到服务器
     }

     /**
     * 获取错误报告文件名
     * @param ctx
     * @return
     */
     private String[] getCrashReportFiles(Context ctx) {
         File filesDir = ctx.getFilesDir();
         FilenameFilter filter = new FilenameFilter() {
             public boolean accept(File dir, String name) {
                 return name.endsWith(CRASH_REPORTER_EXTENSION);
             }
         };
         return filesDir.list(filter);
     }

     /**
     * 保存错误信息到文件中
     * @param ex
     * @return
     */
     private String saveCrashInfoToFile(Throwable ex) {
         Writer info = new StringWriter();
         PrintWriter printWriter = new PrintWriter(info);
         ex.printStackTrace(printWriter);
         Throwable cause = ex.getCause();
         while (cause != null) {
             cause.printStackTrace(printWriter);
             cause = cause.getCause();
         }
         String result = info.toString();
         printWriter.close();
         mDeviceCrashInfo.put("EXEPTION", ex.getLocalizedMessage());
         mDeviceCrashInfo.put(STACK_TRACE, result);
         try {
             //long timestamp = System.currentTimeMillis();
             Time t = new Time("GMT+8");
             t.setToNow(); // 取得系统时间
             int date = t.year * 10000 + t.month * 100 + t.monthDay;
             int time = t.hour * 10000 + t.minute * 100 + t.second;
             String fileName = "crash-" + date + "-" + time + CRASH_REPORTER_EXTENSION;
             FileOutputStream trace = mContext.openFileOutput(fileName,
                     Context.MODE_PRIVATE);
             mDeviceCrashInfo.store(trace, "");
             trace.flush();
             trace.close();
             return fileName;
         } catch (Exception e) {
             Log.e(TAG, "an error occured while writing report file...", e);
         }
         return null;
     }

     /**
     * 收集程序崩溃的设备信息
     *
     * @param ctx
     */
     public void collectCrashDeviceInfo(Context ctx) {
         try {
             PackageManager pm = ctx.getPackageManager();
             PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(),
                     PackageManager.GET_ACTIVITIES);
             if (pi != null) {
                 mDeviceCrashInfo.put(VERSION_NAME,
                         pi.versionName == null ? "not set" : pi.versionName);
                 mDeviceCrashInfo.put(VERSION_CODE, ""+pi.versionCode);
             }
         } catch (NameNotFoundException e) {
             Log.e(TAG, "Error while collect package info", e);
         }
         //使用反射来收集设备信息.在Build类中包含各种设备信息,
         //例如: 系统版本号,设备生产商 等帮助调试程序的有用信息
         //具体信息请参考后面的截图
         Field[] fields = Build.class.getDeclaredFields();
         for (Field field : fields) {
             try {
                 field.setAccessible(true);
                 mDeviceCrashInfo.put(field.getName(), ""+field.get(null));
                 if (DEBUG) {
                     Log.d(TAG, field.getName() + " : " + field.get(null));
                 }
             } catch (Exception e) {
                 Log.e(TAG, "Error while collect crash info", e);
             }
         }
     }

 }

 用法：
 //全局数据存储
 public class App extends Application {
 private final static float HEAP_UTILIZATION = 0.75f;
 private final static int MIN_HEAP_SIZE = 6* 1024* 1024 ;
    @Override
    public void onCreate() {
     super.onCreate();

     // 异常处理，不需要处理时注释掉这两句即可！
     CrashHandler crashHandler = CrashHandler.getInstance();
     // 注册crashHandler
     crashHandler.init(getApplicationContext());

     // 优化内存,以下非必须！
     VMRuntime.getRuntime().setTargetHeapUtilization(HEAP_UTILIZATION);
     VMRuntime.getRuntime().setMinimumHeapSize(MIN_HEAP_SIZE);
         //changeMetrics(this);//修改屏幕Density
         ......
    }
 ｝

异常时写入文件，下面是data/data中生成的文件： 
 

 //
 private static final boolean DebugFlag = false;
 //修改屏幕Density
 public static void changeMetrics(Context context) {
         DisplayMetrics curMetrics = context.getResources().getDisplayMetrics();
         if(!DebugFlag) {
             if (curMetrics.densityDpi == DisplayMetrics.DENSITY_HIGH) {
                 DisplayMetrics metrics = new DisplayMetrics();
                 metrics.scaledDensity = 1.0f;
                 metrics.density = 1.0f;
                 metrics.densityDpi = DisplayMetrics.DENSITY_MEDIUM;
                 metrics.xdpi = DisplayMetrics.DENSITY_MEDIUM;
                 metrics.ydpi = DisplayMetrics.DENSITY_MEDIUM;
                 metrics.heightPixels = curMetrics.heightPixels;
                 metrics.widthPixels = curMetrics.widthPixels;
                 context.getResources().getDisplayMetrics().setTo(metrics);
             }
         } else {
             DisplayMetrics metrics = new DisplayMetrics();
             metrics.scaledDensity = (float)(130/160.0);
             metrics.density = (float)(130/160.0);
             metrics.densityDpi = 130;
             metrics.xdpi = 130;
             metrics.ydpi = 130;
             metrics.heightPixels = curMetrics.heightPixels;
             metrics.widthPixels = curMetrics.widthPixels;
             context.getResources().getDisplayMetrics().setTo(metrics);
         }
 }

• 原帖：http://gundumw100.iteye.com/blog/1182104